Considering how much money Microsloth has, it doesn't surprise me that they would stop something free, IE for Macs.
Problem I forsee is any new web standards would render IE obsolete pretty fast. Recently I started using Safari on a regular basis, but I find as I use it more in different sites over time, it still is not complete and has some issues, I end up pulling up IE to the rescue. In the future even that may not work. Hopefully Safari will be complete by then.